linux-kernel - Re: staging: udlfb -- staging version does not work, external does

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Message-ID: <n2m480988181004111001h28d25ccavf6df2b4db62fadee@mail.gmail.com>
Date:	Sun, 11 Apr 2010 10:01:34 -0700
From:	Bernie Thompson <bernie@...gable.com>
To:	Pavel Machek <pavel@....cz>
Cc:	roberto@...it.it, gregkh@...e.de, Cyril Hrubis <metan@....cz>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: staging: udlfb -- staging version does not work, external does

Pavel,

There are two separate issues you're discussing. Can you check the
lockup issue with the git.plugable.com code?

Thanks,
Bernie

On Sun, Apr 11, 2010 at 9:42 AM, Pavel Machek <pavel@....cz> wrote:
> Hi!
>
>> Thanks for the bug report!
>
> Thanks for trying to solve it :-).
>
>> > (I tried testing with cat /bin/bash > /dev/fb1 and cat /dev/fb0 >
>> > /dev/fb1).
>>
>> I don't think redirects like that will work.  The fbcon module loads
>> against one fb, and can only be switch with utilities like "fbset"
>>
>> > So I tried
>> >
>> >    Roberto De Ioris roberto at unbit.it
>> >    Wed Jun 10 08:00:07 PDT 2009
>>
>> It's good to know Roberto's works. This will be a solvable problem.
>>
>> OK - this may be this bug (fixed at
>> http://git.plugable.com/gitphp/index.php?p=udlfb&a=commit&h=ac7f578b51ce5738386b571d096da4d8889c48e0).
>>  Can you try latest udlfb (git clone
>> http://git.plugable.com/webdav/udlfb ) to see if that's it?
>
> I tried with that patch, no change. dmesg from insmod and cat /dev/fb0
>> /dev/fb1 attempt are:
>
> Apr 11 18:39:02 amd kernel: udlfb: module is from the staging
> directory, the quality is unknown, you have been warned.
> Apr 11 18:39:02 amd kernel: udlfb 1-1:1.0: usb_probe_interface
> Apr 11 18:39:02 amd kernel: udlfb 1-1:1.0: usb_probe_interface - got
> id
> Apr 11 18:39:02 amd kernel: usb 1-1: dlfb: allocated 4 65024 byte urbs
> Apr 11 18:39:02 amd kernel: usb 1-1: dlfb: set_par mode 1024x768
> Apr 11 18:39:02 amd kernel: usb 1-1: dlfb: DisplayLink USB device
> /dev/fb1 attached. 1024x768 resolution. Using 3072K framebuffer memory
> Apr 11 18:39:02 amd kernel: usbcore: registered new interface driver
> udlfb
> Apr 11 18:39:02 amd kernel: VMODES initialized
> Apr 11 18:39:08 amd kernel: usb 1-1: dlfb: open /dev/fb1 user=1
> fb_info=f5087bf0 count=1
> Apr 11 18:39:08 amd kernel: usb 1-1: dlfb: release /dev/fb1 user=1
> count=0
>
> I tried to play with /dev/fb1 a bit more:
>
> root@amd:~# cat /dev/zero > /dev/fb1
> cat: write error: No space left on device
> root@amd:~# cat /dev/fb1
> root@amd:~# echo ahoj > /dev/fb1
> root@amd:~# cat /dev/fb1
> ahoj
> root@amd:~#
>
> ...but still not change on usb connected display, and nothing really
> interesting in dmesg:
>
> Apr 11 18:41:39 amd kernel: usb 1-1: dlfb: open /dev/fb1 user=1
> fb_info=f5087bf0 count=1
> Apr 11 18:41:40 amd kernel: usb 1-1: dlfb: release /dev/fb1 user=1
> count=0
> Apr 11 18:41:46 amd kernel: usb 1-1: dlfb: open /dev/fb1 user=1
> fb_info=f5087bf0 count=1
> Apr 11 18:41:46 amd kernel: usb 1-1: dlfb: release /dev/fb1 user=1
> count=0
> Apr 11 18:41:51 amd kernel: usb 1-1: dlfb: open /dev/fb1 user=1
> fb_info=f5087bf0 count=1
> Apr 11 18:41:51 amd kernel: usb 1-1: dlfb: release /dev/fb1 user=1
> count=0
> Apr 11 18:41:52 amd kernel: usb 1-1: dlfb: open /dev/fb1 user=1
> fb_info=f5087bf0 count=1
> Apr 11 18:41:53 amd kernel: usb 1-1: dlfb: release /dev/fb1 user=1
> count=0
> Apr 11 18:41:59 amd kernel: usb 1-1: dlfb: open /dev/fb1 user=1
> fb_info=f5087bf0 count=1
> Apr 11 18:41:59 amd kernel: usb 1-1: dlfb: release /dev/fb1 user=1
> count=0
> Apr 11 18:42:01 amd kernel: usb 1-1: dlfb: open /dev/fb1 user=1
> fb_info=f5087bf0 count=1
> Apr 11 18:42:01 amd kernel: usb 1-1: dlfb: release /dev/fb1 user=1
> count=0
>
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
>
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